Quote:
Originally Posted by eschwartz
<curious>How is the e-ink using per-book keys if all we need is the device ID?</curious>
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The device ID is combined with some metadata inside the book to generate the book key that is used to get the actual decryption key to decrypt the book.
Oddly, every book on a recent Kindle has a difference book key, unlike books on Kindle for iOS which all use the same book key, or did last time I looked.